#region License
/*
* Copyright 2002-2005 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#endregion
#region Imports
using System.Text.RegularExpressions;
using Spring.Core;
using Spring.Util;
#endregion
namespace Spring.Core{
/// <summary>
/// A base class for all <see cref="Spring.Core.ICriteria"/>
/// implementations that are regular expression based.
/// </summary>
/// <author>Rick Evans</author>
public abstract class RegularExpressionCriteria : ICriteria
{
#region Constants
/// <summary>
/// The default pattern... matches absolutely anything.
/// </summary>
protected const string MatchAnyThingPattern = ".*";
#endregion
#region Constructor (s) / Destructor
/// <summary>
/// Creates a new instance of the
/// <see cref="RegularExpressionCriteria"/> class.
/// </summary>
protected RegularExpressionCriteria() : this(RegularExpressionCriteria.MatchAnyThingPattern)
{
}
/// <summary>
/// Creates a new instance of the
/// <see cref="RegularExpressionCriteria"/> class.
/// </summary>
/// <param name="pattern">
/// The regular expression pattern to be applied.
/// </param>
protected RegularExpressionCriteria(string pattern)
{
Pattern = pattern;
}
#endregion
#region Properties
/// <summary>
/// The regular expression pattern to be applied.
/// </summary>
public string Pattern
{
get { return _pattern; }
set
{
_pattern = StringUtils.HasText(value) ?
value : RegularExpressionCriteria.MatchAnyThingPattern;
Expression = new Regex(Pattern, Options);
}
}
/// <summary>
/// The regular expression options to be applied.
/// </summary>
public RegexOptions Options
{
get { return _options; }
set { _options = value; }
}
/// <summary>
/// The regular expression to be applied.
/// </summary>
public Regex Expression
{
get { return _expression; }
set { _expression = value; }
}
#endregion
#region Methods
/// <summary>
/// Does the supplied <paramref name="datum"/> satisfy the criteria encapsulated by
/// this instance?
/// </summary>
/// <param name="datum">The datum to be checked by this criteria instance.</param>
/// <returns>
/// True if the supplied <paramref name="datum"/> satisfies the criteria encapsulated
/// by this instance; false if not or the supplied <paramref name="datum"/> is null.
/// </returns>
public abstract bool IsSatisfied(object datum);
/// <summary>
/// Convenience method that calls the
/// <see cref="System.Text.RegularExpressions.Regex.IsMatch(string)"/>
/// on the supplied <paramref name="input"/>.
/// </summary>
/// <param name="input">The input to match against.</param>
/// <returns>True if the <paramref name="input"/> matches.</returns>
protected bool IsMatch(string input)
{
return Expression.IsMatch(input);
}
#endregion
#region Fields
private string _pattern;
private RegexOptions _options;
private Regex _expression;
#endregion
}
}
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